Overload relay



Dec. 13, 1927.

` B. 0. AUSTIN ovERLoAD RELAY Filed Jan. 30. 1923 Fig. 1.

WlTNESSS:

2 Sheets-Sheet 1 INVEN fO Basel/m 0. H I7.

` v V ATTORNEY Dec. 13, 1927.

B. O. AUSTIN OVERLOAD RELAY Filed Jan, 30. 1923 2 Sheets-Sheet 2 WTNESSES:

mvENToR l, Bascum Hasi/i7.

ATTORNEY lnltented Der.. i3, 1927.

STATES BAQG''M 0. AUSTN, 011.' WILKINSBUBG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELTRIC 86 MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

OVEBLOAD RELAY.

,Application led January 30, 1923. Serial No. 615,832.

"lt/ly' invention relates to overload trip switches and it hasy special relation to switches adapted to be mounted on the dashes of ,trolley busses or the like.

An object of my invention is to provide a switch `of the above-mentioned character that is' adapted to be actuatedfrom two independent sources.

l Another object of my invent-ion is to provide, in a switch mounted upon one side of a panel board and adapted to be actuated automatically in response to predetermined vaines of current, manually controlled means, located upon the other side of the panel board, for actuating the switch independently of the automatic means.

A more specific object of my invention is to provide an automatic switchingmechanism adapted to be placed on the opposite side ci the dash of an electric vehicle, or the like, trom the operator and having control means extending through the dash whereby switching member may be actuated mannelly by the operator it so desired. The device may be used as a relay for operating a line switch.

Other ob'ect-s, as well as details of construction w ereby my invention may be utilined, will be apparent from the following description, taken in conjunction with the' accompanying drawings, Awherein ifi 1ure 1 is a view, mainly in side elevation ut partly in section, of a switch constructed 1n accordance with myv invention,

Fig. 2 is a bottom plan view of the switch shown in Fig. 1, and

llig. 3 is a view, in front elevation, of the switch shown in Fig. 1.

Referring to the drawing, a switch 1 is mounted upon a lpanel board 2 in any suitable manner, as, tor example, by bolts 3. The panel board 2'is secured, in any suitable manner,'to the rear side of the dash i of a trolley bus, or the like., The switch 1 emhodies a coil 5 that issecured within a suppcrtingbracket 6, a core member 7 operating within the coil 5 and controlled thereby, a

dashpot 3 for governing the action of the core member 7, and a switch member 9.

v ,A The switch member 9 is pivotally mounted upon the supporting bracket -6 and is prowith a contact member 11 Jfor bridgtwo stationary contactv members 12 and 13, which are mounted upon Athe panel board. 2, when the switch is' in its closed position. The switch member 9 is also provided with a projecting portion 15 adapted to be engaged by a latch 16, for a purpose to be hereinafter set forth. A spring member 17 is provided for normally maintaining 6.0 the switc member 9 in a postionto bridge the Contact members 12 and 13.

An arm 18 is pivotally mounted upon the supporting bracket 6 and has latch 16 formed on one end and a depending arm o5 19 on the other end thereof. A spring 21 biases the latch 16 toward engagement with the switch member 9.

n A push-button 22 is arranged on the opposite side of the dash i that is, on the side ad]acent the operator, from the switch member 9. A rod 23, preferably of some insulating material, is secured tothe push-button 22 and extends through the dash 4 and panel-board 2 to a position adjacent the 75 center of bridging contact member 11. A spring 24 biases push-button 22 and rod 23 away from engagement with contact member 11.

A manually operable rod 25 extends 80 through the dash 4 and anal-board 2. A round bar I26, of larger iameter than the rod 25, is threaded to the rod 25 and is secured against rotation relative thereto by a rivetv 27. A transverse slot 27 is cut in the 86 end of the bar 26 to receive one end of a link 29. A longitudinal slot 31 is cut in the link 29. A cotter-pin or other securing means is linserted through the end of the bar 26 and a knob 33 that is detachably secured thereto by means of threads 34 and setscrew 35. A spring 36 normally biases link 29 away from engagement with the arm 19.

The operation of my invention may be set forth as follows: When the current traversing coil 5 reaches a predetermined value, corresponding to an overload on a drivin motor, the movable core 7 is actuatedan serves to trip the movable switch member 9 105 and move `the bridging member 11 out of engagement with the contact members 12 and 13, thus breaking this auxiliary' circuit and causing the interruption of the motor circuit in accordance with a familiar practice.

Upon the switch member 9 assuming its open position, the latch 16 engages the projecting portion 15 ofthe switch member 9 and maintains the switch in its open position against the action of the spring 17. p

In case it is desired to reset the switch, the operator grasps the knob 33 and pulls the rod 25 against the action of the spring 36. The link 29 is thus actuated into engagement with the depending arm 19 to cause the disengagement of latch 16vfrom the projection 15 of the switch member 9. The switch member 9 is then actuated by the sprin 17 to its closed sition, whereby the movale contact mem er 11 again bridges the contact members 12 and 13. The spring 36 will return the rod 25 and knob 33 to their initial positionl upon release of the knob by the operator.

If the operator4 wishes, at any time, to

break the' circuit through contact members 12, 11 and 13, he may press the push-button 22. The rod 23 will then engage the bridging contact member 11 and actuate 'the switch member 9 to its open position, whereupon the latch 16 will operate as described above. The spring 24; will return the rod 23 and push-button 22 to their initial positions when the operators hand is removed from the push-button. The-switch may be reset as described above. v

An advantage of 'my invention is that the main mechanism of the switch may be placed near the motor and control apparatus, thus conserving space on the inside of the dash, and still be under the control of the operator.

Still another advantage of my invention is that, in addition to the automatic operation of the switch under predetermined conditions, the operator may, at any time, operate the switch without leaving his usual station.

It will be understood that the switch mechanism shown and described is purely Aillustrative and that various modifications may be made therein without departing from the S irit and scope of my invention. I desne, t erefore, that only such limitations shall be imposed as are indicated in the appended claims.

I claim as my invention:

1. A switch mechanism comprising a plurality of stationary contact members, a movable contact member cooperating therewith, means for normally biasing said movable Contact member toward engagement with -said stationary Contact members, electro-responsive means for effecting disconnection of said contact members,and manually operated means for effecting disconnection of said contact members independently of said -electro-responsive means.

switch member in its open position, a rod extending through said panel board, a link pivotally secured to said bar for releasing said latch upon actuation of said bar, and a push button upon the opposite side of said panel board foractuatinor said switch member independently of said electro-responsive means.

3. A switch mechanism comprising, in combination, a panel board, stationary and movable switch members carried by the panel board, means adapted to urge continuously the movable switch member toward the stationary switch me1nbers, electro-responsive means adapted to move said movable switch member out of contact with the stationary7 switch members, latch means disposed to engage the movable switch member when operated by the electro-responsive means, manually operable means for actuating said movable switch member independently of the electro-responsive means, and manually operable means for releasing thelatching means.

l. A switch mechanism ccmprising, in combination, a panel board, stationary and movable switch members carried by the panel board, means adapted to urge continuously the movable switch member toward the stationary switch members, electro-responsive means adapted to move said movable switch member out of contact with the stationary switch members, latch means disposed to engage the movable switch member when operated by the electro-responsive means, manually operable means for actuating said movable switch member independently of the electro-responsive means, and manually oper-v able means or releasing the latching means, said latching means being disposed to co- -operate to retain the movable switch member in contact with the stationary switch members.

In testimony whereof, I have hereunto sub-- scribed my name this 25th day of January,

BASCUM O. AUS'IIN. 

